Background Engagement in multiple risk behaviours can have adverse consequences for
health during childhood, during adolescence, and later in life, yet little is known about the …

Objectives Unintended harm theory as related to public health interventions (PHI) is under
developed, with harm evaluation and reporting often absent or incomplete. This review …

College students who use alcohol and marijuana often use them simultaneously, so that
their effects overlap. The present study examined whether negative consequences …

Abstract Background and Aims Youth poly-substance use, associated with long-term
negative health and social outcomes, is of increasing concern following the rise of e …

Background Adolescent risk behaviours such as smoking, alcohol use and antisocial
behaviour are associated with increased risk of morbidity and mortality. Patterns of risk …

Objectives. We examined the coevolution of adolescent friendships and peer influences with
respect to their risk behaviors and social networking site use. Methods. Investigators of the …

The current study examined the prevalence of alcohol, tobacco and drug use and comorbid
use of these substances among 45,425 students in grades 7 to 12 as part of the 2008–09 …

OBJETIVO: estudar a prevalência e fatores associados ao uso de tabaco, álcool e outras
drogas. MÉTODOS: estudo transversal com adolescentes escolares da rede estadual de …

Substance use during adolescence is a public health concern due to associated physical
and behavioral health consequences. Such consequences are amplified among concurrent …

Objective This study identifies and compares outcomes in young adulthood associated with
longitudinal patterns of alcohol and marijuana use during adolescence among urban youth …